Question:
The hardest substance of human body is _________
The hardest substance of human body is _________
Show Hint
The enamel of the tooth crown is about 96 percent mineral.
Updated On: Nov 12, 2026
- enamel
- dentin
- cementum
- histone
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept
Enamel covers the crown of a tooth and is about 96 to 97 percent mineral (hydroxyapatite crystals of calcium phosphate), secreted by ameloblasts.
Step 2: Compare
Dentin, beneath it, and cementum, covering the root, contain much more organic matter and are softer.
Step 3: Other option
Histone is a chromosomal protein, not a hard tissue.
Final Answer:
Enamel is the hardest substance of the human body. \[ \boxed{\text{(A) }\text{enamel}} \]
Enamel covers the crown of a tooth and is about 96 to 97 percent mineral (hydroxyapatite crystals of calcium phosphate), secreted by ameloblasts.
Step 2: Compare
Dentin, beneath it, and cementum, covering the root, contain much more organic matter and are softer.
Step 3: Other option
Histone is a chromosomal protein, not a hard tissue.
Final Answer:
Enamel is the hardest substance of the human body. \[ \boxed{\text{(A) }\text{enamel}} \]
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